Find the regular factors. Leave out 1 and the number itself.
2, 3, 5, 6, 10, 15, 29, 30, 58, 87, 145, 174, 290, 435
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Prime numbers don't have proper factors.
The proper factors of 26 are 2 and 13
Prime numbers don't have proper factors.
Proper factors do not include one and the number itself.
The proper factors of 64 are 2, 4, 8, 16 and 32. For proper factors of a number exclude 1 and the number itself from the list of factors.